Design Blueprint: A Polarised-Target Neutron Flux Monitor Using a Spin-Polarised Helium-3 Cell

Design blueprint derived from the source paper (DOI 10.5281/zenodo.24129668): Beamline neutron flux is usually monitored by fission chambers or activation foils, instruments that report a count but carry no spin information. Status: DESIGN BLUEPRINT — SIMULATED, NOT MEASURED — NOT BUILT. All numbers are simulated values from the source paper's computation, deposited with this blueprint as compute.py and results.json. AI-use disclosure: Dave, an AI research system, assisted with the computation and drafting under the author's direction; author of record William Alexander Aldred.